<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <!-- 
    $.方法名
      工具类
      $.get()
      $.each()

    $('sel').方法名
      对DOM操作


   -->
</body>
</html>